Constant Volume Amplifier (CB26275E)

This circuit is from a 1990s publication by William Sheets. The circuit consists of a stage whose gain is adjusted according to the signal intensity.

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LASER Driver (CB21008E)
We found this circuit in an American publication from the 1990s. The circuit has a Darlington...
Light Alarm with the 741 (CB12591E)
The sensor for this alarm is an LDR and it consists of an oscillator that goes into action when...
Stepper Motor Drive (CB13797E)
This circuit was found in a computer publication from the 1970s. The transistors can be the BD135...